QuickBooks Online's option for sending invoices through the program can be a time-saving way to get the information you need to your customers. When you click Save and send, a new window should pop up to let you take a look at the preview first and format the email how you'd like. Since you're saying everything suddenly disappears, I have some troubleshooting for you.
The troubleshooting I'm about to outline helps us rule out the possibility that it's a cache, browser, app, or Internet issue causing this behaviour in QuickBooks Online. Being a cloud platform, it can sometimes get hung up over these kinds of things, and the following steps help to ensure that everything is running smoothly.
Reset your Internet or try on another computer or device
Temporarily disable pop-up and ad blockers
After each of these steps, try Save and send again. If the problem persists, move to the next one. If you've gone through the list with no luck, getting in touch with support is the next step to take.
Our support team is geared with the tools to gather details and get you back on track. An agent would be happy to go over this with you to make sure things are sorted out and working as they should in your books. Here's how to get in touch.
Schedule a Callback or Chat: click (?)Help in the upper right > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat. Support is available from Monday to Friday between 9 a.m. and 8 p.m. ET.